We read 8 results from City of Fountain Valley’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.
Serves about 56,747 people · Water system ID CA3010069 · Read the district’s 2025 report (opens in a new tab)
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Results from the 2025 report
Each number is copied from the district’s report and links to the page it’s printed on. Where the report lists several plants, wells or purchased water, the highest is shown.
| Contaminant | Result | Health goal | Legal limit | What it means |
|---|---|---|---|---|
| Chromium-6average · range 0.17 to 2.4 · listed as a violation in the report · Local groundwater · 2025 report, page 7 | 1 ppb | 0.02 ppb | 10 ppb | Above the health goal50x the health goal |
| Lead90th percentile of 33 homes tested, 0 over the action level · listed as a violation in the report · sampled 2024 · Customer taps · 2025 report, page 6 | 6 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal30x the health goal |
| Uraniumaverage · range 2.83 to 6.71 · listed as a violation in the report · printed as 3 pCi/L · sampled 2024 · Local groundwater · 2025 report, page 7 | 4.47 ppb | 0.6 ppb | 30 ppb | Above the health goal7.5x the health goal |
| Chlorineaverage · range 0.29 to 0.7 · listed as a violation in the report · Distribution system · 2025 report, page 6 | 0.46 ppm | None set | 4 ppm | Below the legal limit |
| Copper90th percentile of 33 homes tested, 0 over the action level · listed as a violation in the report · sampled 2024 · Customer taps · 2025 report, page 6 | 0.14 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Fluorideaverage · range 0.31 to 0.45 · listed as a violation in the report · Local groundwater · 2025 report, page 7 | 0.4 ppm | 1 ppm | 2 ppm | Below the health goal |
| Nitrate (as N)average · range 0.76 to 2 · listed as a violation in the report · Local groundwater · 2025 report, page 7 | 1.4 ppm | 10 ppm | 10 ppm | Below the health goal |
| Sodiumaverage · range 36 to 45 · Local groundwater · 2025 report, page 7 | 41 ppm | None set | None | No health limit |
Utility results describe the whole system, measured where water enters the pipes, not your tap. Your home’s plumbing can add lead or copper.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in City of Fountain Valley’s water between Mar 2023 and Jul 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFHxS3.5 pptFound in 1 of 16 samples · highest resultNo federal limit in force for this one
- Lithium36.1 ppbFound in 3 of 16 samples · highest resultAbove EPA’s health reference level of 10 ppb (a guide, not a legal limit)
Source: EPA UCMR 5 occurrence data. The highest single result is shown; one high sample doesn’t mean every glass is that high.
What you can do
Nothing here is an emergency notice: if the district has a violation, it must tell customers directly. If you’d like to lower these at your tap, these are the treatments that remove them, and the catalog shows the models certified for each. Ranking is by certified removal; commissions never change the order.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
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